Brake for bicycles or other like vehicles.



Patented Dec. 24, I90l.

2 Sheets-Shaat I.

' W. B. GUVETT.

BRAKE FOB BICYCLES OR OTHER LIKE VEHICLES.

(Application filed Dec. 20, 1900.!

(No Model.)

4: mums awns w. PHnTauwo WASHINGTON.

No. 689,485; Patented Dec. 24, I90l. W. B. GOVETT.

BRAKE FDR BICYGLES OR OTHER LIKE VEHICLES. (Application filed Dec. 20, 900.1 (In local.) '2 Sheets-Sheet 2.

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Nrrno STATES ATENT Fries.

BRAKE FOR BICYCLES OR OTHER LIKE VEHICLES.

SPEGlFIGATION forming part of Letters Patent N 0. 689,485, dated December 24, 1901. Application filed December i1900. Serial No. 40,603. (No model.)

To all whom it may concern.-

Be it known thatI, WILLIAM BOYES Go- VETT, a subject of the Queen of Great Britain and Ireland, and a resident of 134. Albert street, Brisbane, in the Colony of Queensland, have invented certain new and useful Im .provements in Brakes for Bicycles or other teeth of the sprocket-wheel, and at about the center of the length of this arm is secured thereto a pin, to which is attached by a link, if necessary, an adjusting-screw, on one end of which is a jaw, to which are secured bybolt and not two rods with forked ends. Gonnected to the forked ends are clips which fit around and slide'along the chain-stays. The adjusting-screw and connecting-link may be dispensed with by lengthening the ends of the forked rods and connecting same direct onto the pin above referred to by bolt and nut. (See Figure 5.) Onto the sliding clips are secured leather or other brakeblocks which engage with the rim of the back wheel. The lever-arm is supported by a pressure or spiral spring secured to the frameof the machine.

To fully describe my invention, I will now refer to the drawings, in Which Fig. l is a side elevation of brake fitted to bicycle with brake applied; Fig. 2, a plan of same; Fig. 3, a section of chain-stay, showing clip and brake-block; Fig. 4:, an end of lever-arm; Fig. 5, a plan of forked rods connected to pin ot' lever-arm where the adj usting-screw is dispensed with; Fig. 6, a view of one side of bell-crank; Fig. 7, r view of reverse side of bell-crank; Fig. 8, a front view of bell-crank; Fig. 9, an elevation of bellcrank pivot-pin. Fig. 10'is a detail view of the link G The reference-letters indicate like parts in all figures.

A is the bottom-bracket shell; B, the driving-axle; O and O, the chain-stays; D, theback-wheel rim E,the ti re,and F the sprocketwheel.

Fitting onto the axle B'or onto the bottom bracket shell, between the bottom bracket and driving sprocket-wheel, is a lever-arm G, to the end of which is pivoted a bell-crank H, the lower arm of which isin two parts and which grips the rim of the sprocket-wheel on either side. The upper arm or pawl engages with the teeth of the sprocket-wheel when applying the brake. About the center of the lever-arm G-is secured a pin G, upon which is pivoted a link G having its lower half at rightanglestotheupperhalf. Thelowerhalf is to receive an adjusting-screw J for the purpose of taking up when necessary the wear of brake-blocks or chain. One end of the adjusting-screw is provided with jaws J. Connected to same by bolt and nut are forked rods or straps K and K. Onto the forked ends of these rods are clips M and M, of springsteel, preferably lined with leather, which are sprung onto the chain-stays, upon which they slide along. Secured to these clips are leather or other brake-blocks N and N, which are molded to correspond with the section of the Wheel-rim. r

S is a pressure-spring secured to the frame of the machine, supporting the lever-arm G and preventing any shaking or movement of the whole of the brake mechanism when the brake is not in use. A spiral tension-spring may be substituted fastened to the frame of the machine in any convenient position. The lever-arm G may be slotted out orprovided with a series of holes at the end (see Fig. 4) for adjusting the position of the bell-crank when replacing the sprocket-wheel by one of a different size.

Fig. 3 shows a detailof the clips M and M, in which M is the clip; 0, the chain-stay; K, end of forked rod; L, packing, and 0 bolt and nut securing same together.

Figs. 6, 7, and 8 show detail of bell-crank. The top arm or pawl is made of solid metal slotted out to form a chisel-point for engaging with the teeth of the sprocket-wheel. The sides form cheeks between which the sprocketwheel rotates. A shoulder is formed on one side to contact with the lever-arm G, as shown in Fig. 1, to relieve the pressure on the pivotpin. The bottom arm consists of two pieces of spring-steel riveted to the top arm, one on each side. These springs grip the rim of the sprocket-wheel with sufficient pressure to throw the top arm or pawl in or out of action.

In Figs. 6, 7, and S, H is the top arm or pawl, slotted out, as shown in front view, Fig. 8, forminga chisel-pointH H is the shoulder, which rests upon the lever-arm G when pawl engages with tooth of sprocket-wheel. H and H are the cheeks between which the sprocket-wheel rotates. H and H are two pieces of spring-s1 eel forming the bottom arm of the bell-crank which grips the rim of the sprocket-wheel, and H 11 stud or stop controlling the movement of the bell-crank by 'contactwith the lever-arm G. The bell-crank is secured to the lever-arm with pivot-pin and nuts. A collar is formed on the pin. (See Fig. 9.)

In applying my invention immediately the driving sprocket-wheel isflarrested by backpedaling the top arm or pawl of the bellcrank is thrust against the periphery of the sprocket-wheel F, the chisel-point contacts with one of the teeth and prevents the wheel rotating, and the shoulder H of the bell-crank presses on the lever-arm G, which on being depressed draws forward the forked rods K and K, which in turn cause the brake-blocks secured thereto to impinge with the rim of the back wheel, which effectually and instantlybrakes the machine, and, if necessary, the same can be brought to a dead-stop, according to the pressure employed in backpedaling. The brake remains firmly locked by the pawl of the bell-crank in contact with one of the teeth of the sprocket-wheel, and not until the forward motion is applied to the pedal-cranks can the brake be relieved, but on instantly doing so the pawl of the crank I, is thrown out of contact with the sprockettooth and the shoulder of the pawl freed from the lever-arm, which is then raised to its normal position by the pressure-spring.

Having now described my invention, what -I claim as new, and desire to secure by Letters Patent, is

1. In improvements in brakes for bicycles and other like vehicles, the bell-crank H, the top arm slotted out to a chisel-point, acting as a pawl between two cheeks and provided with a shoulder, the lower arm composed of two pieces of spring-steel and provided with a stud and a brake and connections operated by said bell-crank lever as and for the purpose set forth and as herein described.

2. In combination with a bicycle or like vehicle, of a brake, consisting of a pin, a leverarm connected to said pin and fitting around the crank-axle, a spring connected to the crank-hanger and having its free end contacting said lever, means carried by the free end of said lever to engage the teeth of the sprocket-wheel when said wheel is propelled backward, and a brake connected with said pin, substantially as described.

3. In combination with a bicycle,of a brake consisting of a pin, a lever surrounding the crank-axle and connected to said pin intermediate of its length, means carried by the free end of said lever adapted to be operated by cont-act with the teeth of a sprocket-wheel when the same is back-pedaled, a spring for returningsaid lever,anadjustable connection connected to the inner end of the pin, rods connected to said connection, slides mounted upon the lower bars of a bicycle-frame and connected to said rods, and brake-shoes carried by said slides to engage the rim of a bicycle-wheel.

4. In combination with a bicycle,of a brake comprising a spring-actuated lever, a bellcrank lever carried upon the free end thereof to engage the teeth of a sprocket-wheel when the same is back-pedaled, and means connected to said lever to retard the motion of a wheel of the bicycle when the bell-crank lever engages the teeth of the sprocket-wheel.

In witness whereof I have hereunto set my hand in presence of two witnesses.

WILLIAM BOYES GOVETT.

Witnesses:

E. GASTON ABEEL, O. S. ABEEL. 

